The diameter of a mercury atom, atomic number 80, compared with the diameter of a zirconium atom, atomic number 40, is approximately
1) half as large
2) twice as large
3) the same size
because the
4) atomic masses are not appreciably different.
5) greater nuclear charge pulls the orbiting electrons closer.
6) atomic number and atomic diameter are directly proportional to each other.
7) atomic number and atomic diameter are inversely proportional to each other.
Answer: 3, 5
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A. She showed how to calculate the level in which an atom's electrons were most likely to be found. B. She proved that stars are composed mainly of hydrogen. C. She classified stellar spectra by temperature. D. All of these choices are correct.
Looking through your telescope tonight, you observe a distant galaxy called RXJ1800 and notice that it is very near in the sky to the bright star Vega. What can you conclude from this observation?
A) RXJ1800 and Vega will both set in the west at about the same time. B) Vega orbits the center of mass of RXJ1800. C) Vega and RXJ1800 must be no more than a few light-years apart. D) If you observe them again in a few nights, RXJ1800 and Vega will be farther apart than they appear tonight.
What distinguishes the spectral type of a star?
A. the lines in its spectrum B. its brightness C. its distance D. its velocity
What makes a semipermeable membrane selective for one chemical species but not another?
A) The pores in the membrane select by size, they are big enough for water only. B) The material is hydrophilic and therefore only allows water through. C) The material is hydrophobic and therefore only allows water through. D) The material chemically reacts with everything but water. E) none of the above